Back to EveryPatent.com
United States Patent | 5,187,390 |
Scott, III | February 16, 1993 |
A switched capacitor input circuit that reduces nonlinear input current due to input switch charge injection. The addition of a shunt capacitor with a series switch to signal ground at the input switch of a sampling network is used to sample and hold the input switch charge injection. This input switch charge injection can then be returned as input switch channel charge during the next sampling phase eliminating the need for the input signal to supply this charge.
Inventors: | Scott, III; Baker P. L. (Austin, TX) |
Assignee: | Crystal Semiconductor Corporation (Austin, TX) |
Appl. No.: | 729355 |
Filed: | July 12, 1991 |
Current U.S. Class: | 327/91; 327/65; 327/362; 327/379 |
Intern'l Class: | H03K 017/16; G11C 027/02 |
Field of Search: | 307/352,353,355,491,494,572 328/128 |
3586880 | Jun., 1971 | Fitzwater, Jr. | 307/572. |
4323796 | Apr., 1982 | Lathrope | 307/572. |
4393318 | Jul., 1983 | Takahashi et al. | 307/353. |
4585956 | Apr., 1986 | Lie | 307/572. |
Foreign Patent Documents | |||
0194700 | Aug., 1986 | JP | 307/353. |
0067817 | Mar., 1990 | JP | 307/572. |